Honestly, I am always terrified that my fans can see every plot point coming down the pike and aren't surprised at all by events in the story. I was especially fearful about The Vigilante in the As The World Dies Trilogy, but many fans said they never suspected the real culprit. Others did see it plain as day, but the majority did not. That was an enormous relief.
There are definitely certain events that completely surprised readers in the As The World Dies Trilogy. I get plenty of emails that say, "WTF!" I can usually tell exactly where a reader is from the contents of an email."Oh, my God! You killed ________. All bets are off!" write the fans of the story.
I have received that phrase multiple times.
Yes, writers have a lot of neurosis. This is just another one.
As I get ready to move forward on my next project, I hope that I will once again surprise readers with my twisted ideas and turn out a book they will love.